Oncology (from the Ancient Greek onkos (ὄνκος), meaning bulk, mass, or tumor, and the suffix -logy (-λογία), meaning "study of") is a branch of medicine that deals with tumors (cancer). A medical professional who practices oncology is an oncologist.
病理學Pathology：In medicine, pathology is the study and diagnosis of disease. The related scientific study of disease processes is called "general pathology." Medical pathology is divided into two main branches, anatomical pathology and clinical pathology.